Unknown sensor on 2000 k3500 5.7

[LTG]

Hi all,

 

I’m a newbie to the forum. I just had a complete rebuild done on my 5.7 for my 2000 k3500. Almost have it all back together. There is a sensor wire and a threaded hole in the block on the passenger side under the exhaust and just in front of the starter. I can’t figure out what should go there. I don’t have any parts or sensors left. Assuming it’s something the rebuilders tossed when they stripped it down. Any ideas? 

[txab]

Crank sensor maybe

[richard wysong]

It's for the knock sensor. They are torque sensitive so careful with the install

[Brian Lindsey]

on the side in front of starter would be the cam sensor

[richard wysong]

not on a 57, the distributor is the cam sensor. it's for the knock sensor. I have broken more than 1 changing the starter

[Brian Lindsey]

i just looked on my all data, and you are correct cam sensor is on back of engine in distributor , and that is the knock sensor , , my mistake

[richard wysong]

I don't know a lot about LS engines but SB chevy is no problem. LOL